Yamaha R6 Throttle body question - megasqirt

rob_lee · Post by **rob_lee** » Thu Feb 22, 2007 3:04 pm

Hi all.

Just signed up here

Anyway im fitting a set of R6 tb's to a 1.6 16v Vauxhall engine using V3

Can anyone help me identify what this is? Im good on car stuff but using bike parts is new to me.

Thanks in advance

Rob

Uncle Bob · Post by **Uncle Bob** » Thu Feb 22, 2007 9:59 pm

that is the cold idle control. coolant is ran through it, and raises the idle until the motor warms up.

rob_lee · Post by **rob_lee** » Thu Feb 22, 2007 10:43 pm

Thanks matey

Im using megasquirt V3, Shall i disable that cold start control thing or use it?

65ShelbyClone · Post by **65ShelbyClone** » Fri Feb 23, 2007 12:46 pm

That would actually be pretty handy to keep.

You don't need to configure any idle air control valve unless the Yamaha system presents a problem.

Uncle Bob · Post by **Uncle Bob** » Fri Feb 23, 2007 12:51 pm

simplicity is best. I'd use the stock valve too.....have to route coolant lines to it, but shouldn't be hard.

Honda car EFI engines used the same setup for decades. Its a good system IMO

rob_lee · Post by **rob_lee** » Sat Feb 24, 2007 1:12 pm

Question tho... can i leave the holes open where the sliders were and use the two outlets at each end of the TB's for brake servo pipe or will it cause too much air restriction or disturbance?

Uncle Bob · Post by **Uncle Bob** » Sat Feb 24, 2007 1:15 pm

why remove the slides? It will improve drivability without effecting performance.

edit: I misread your question. There is no vacuum at those outlets. Those ports are for intake pressure reference for the slides (IE, pressure changes due to ram air on the stock bike)

rob_lee · Post by **rob_lee** » Sat Feb 24, 2007 1:59 pm

where can i get a take off point for the brake servo?

Will it be easier to tap into the inlet manifold then?

rob_lee · Post by **rob_lee** » Sat Feb 24, 2007 2:01 pm

Also will not using an electrical idle control valve upset the megasquirt management?

Uncle Bob · Post by **Uncle Bob** » Sat Feb 24, 2007 2:01 pm

rob_lee wrote:where can i get a take off point for the brake servo?

Will it be easier to tap into the inlet manifold then?

anything between the butterflies and the intake valves. No vacuum anywhere else.

You can tie the individual vacuum ports together, or make new ones.

Uncle Bob · Post by **Uncle Bob** » Sat Feb 24, 2007 2:05 pm

rob_lee wrote:Also will not using an electrical idle control valve upset the megasquirt management?

what electric idle control valve? The one on the ITB's isn't electronic.

But MS doesn't really care how the throttle is manipulated. Its job is to give the right amount of fuel for a given RPM/intake pressure.

If you were installing an IAC controlled by MS, then that would be different, but assuming you're using the stock cold idle adjuster, there is no electrical connection to anything. It purely operates off of coolant temp. (it also doesn't "control" idle, just raises the idle slightly until engine is up to temp)

rob_lee · Post by **rob_lee** » Sat Feb 24, 2007 2:07 pm

So in other words i just tape up the wires on megasquirt that would normally go to the ICV?

Rob

PS.. Thanks for you help Uncle Bob

Uncle Bob · Post by **Uncle Bob** » Sat Feb 24, 2007 2:08 pm

rob_lee wrote:So in other words i just tape up the wires on megasquirt that would normally go to the ICV?

Rob

PS.. Thanks for you help Uncle Bob

exactly. Not much point on using the function when this does the same thing in a simpler manner

rob_lee · Post by **rob_lee** » Sat Feb 24, 2007 2:11 pm

Excellent

Any idea about the vacuum take off for the brake servo?

Uncle Bob · Post by **Uncle Bob** » Sat Feb 24, 2007 2:14 pm

you didn't like my first answer on that?

There should be vacuum ports that feed a log that feeds the stock MAP sensor. Those are the only stock vacuum ports. If you don't like them, you'll have to add new ones

rob_lee · Post by **rob_lee** » Sat Feb 24, 2007 2:27 pm

Will there be enough vacuum if i use the small MAP sensor hoses and joint it to the brake servo pipe?

Uncle Bob · Post by **Uncle Bob** » Sat Feb 24, 2007 2:30 pm

someone that has done this type of conversion before would be better at answering that (I play with bikes, never done ITB's on a car)....but keep in mind, ITB's will lower your vacuum. Even with mild cams, 10-12"/hg is about the most vacuum you will see, and it drops off quickly when cruising

Will the ports flow enough, I don't know.....not sure how much flow is really required. I would think lack of vacuum would be a problem before lack of flow.....